minor bug fix

transport/disk.py

@@ -219,6 +219,7 @@ class SQLiteWriter(SQLite,DiskWriter) :
 		elif type(info) == pd.DataFrame :
 			info = info.fillna('')
 			info = info.to_dict(orient='records')
+        
 		if not self.fields :
 			_rec = info[0]
 			self.init(list(_rec.keys()))